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JEE Main levelSingle correct optionDifficulty 2 of 3sc177

Which of the following orders correctly shows increasing coagulating power of the electrolytes towards a negatively charged $As X_{2} S X_{3}$ sol?

A $NaCl < BaCl X_{2} < AlCl X_{3}$
B $NaCl < AlCl X_{3} < BaCl X_{2}$
C $BaCl X_{2} < NaCl < AlCl X_{3}$
D $AlCl X_{3} < BaCl X_{2} < NaCl$

Answer: A

For a negative sol the cation coagulates, and the power increases with its charge:

Na X^{+}

(1) <

Ba X^{2 +}

(2) <

Al X^{3 +}

(3). The correct increasing order is therefore

NaCl < BaCl X_{2} < AlCl X_{3}

.

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